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Modern Physics Letters B

CONTROL OF ABSORPTION AND KERR NONLINEARITY BASED ON QUANTUM COHERENCE WITHOUT DRIVING FIELD

Zhonghua Huang, Ai-Xi Chen, Zhao-Chu Chen, Li Deng

Published Oct 26, 2010• 10 citations
Publisher

Abstract

In a three-level atomic system, the influences of spontaneously generated coherence on the linear absorption and the Kerr nonlinearity are investigated. Our studies show that properties of linear absorption can be dramatically affected by the effect of spontaneously generated coherence. With increase of intensities of spontaneously generated coherence, absorption inhibition will occur, and finally the atomic medium becomes transparent. Furthermore, we find that the Kerr nonlinearity can be obviously enhanced under the action of effects of spontaneously generated coherence. Comparing with traditional scheme of the electromagnetically induced transparency, absorption and Kerr nonlinearity can be controlled without need another driving field in our scheme.

DOI
10.1142/s0217984910025310

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A theoretical investigation of the effect of spontaneously generated coherence and the applied laser field intensity on the electromagnetically induced transparency and Kerr nonlinearity is carried out.It is found,with spontaneously generated coherence present,the Kerr nonlinearity can be clearly enhanced is carried out,and the maximal Kerr nonlinearity does not only enter the electromagnetically induced transparency window as the spontaneously generated coherence intensitifies,but also gets enhanced about 10 times with large SGC coefficients than that with no SGC effect.In addition,the enhanced Kerr nonlinearity can also be obtained by decreasing the ratio of the coupling field intensity to the control field intensity.
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We investigate the reverse saturable absorption (RSA) and optical limiting (OL) in a three-level V-type quantum system considering the effect of the spontaneously generated coherence (SGC). It is shown that in the absence of the SGC effect, the saturable absorption (SA) is dominant in the system. By taking into account the SGC effect, we prove that the SA dramatically switches to the RSA. Moreover, it is demonstrated that the OL threshold and OL efficiency can be controlled by the SGC effect. In addition, we show that the applied field properties such as detuning can modify the SGC-induced optical limiter efficiency. It is also shown an increase in the atomic density and length of the medium makes the optical limiter more efficient. The analytical calculation shows that the Kerr nonlinearity caused by the SGC effect is the main mechanism of the system evolution. Finally, the theoretical Z-scan experiment is presented to confirm the obtained results. Our proposed scheme can be useful to design controllable atomic optical limiters for optical devices with different sensitivities.